.tt{
    margin: 20px auto;
    border-collapse: collapse;
}
.tt tr th,.tt tr td{
    border: 1px solid darkblue;
    padding: 8px;
    text-align: center;
    font: 20px/25px "Adobe 楷体 Std R";
}
.tt tr:hover{
    background-color: antiquewhite;
}